Okay. I managed to find a g skill serial number decoding scheme to identify the chiip inside it. It correctly identified my chips to be samsung. Aalso read somewhere that all C14 are samsung. Cannot confirm that, but will explain why some with C16 is having problems.
G.Skill serial numbers always start with the year and week, for example 913 is the 13th week of 2009 while 1240 is the 40th week of 2012. Pretty straightforward.
After that there are four digits which stand for different ICs/manufacturers:
AB40 - Samsung/Hynix (seems to be both, only used for a short time)
000x - Hynix (only on samples?)
0000
x10x - Nanya eTT/uTT
2100
x15x - ??? eTT/uTT
2150
x20x - Powerchip/PSC (sometimes eTT/uTT)
1200
x30x - Micron
3300
x40x - Hynix
1400/2400/
3400
x50x -
Samsung
1500/2500/250B
x60x - SpecTek (/Micron)
1600
x80x - Elpida
0800/1800
3800 MxH-E Hyper
http://www.xtremesystems.org/forums/showthread.php?283666-Figuring-out-G-Skill-s-SNs
Hopefully it will be helpful to some